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Abstract

The concept of this invention is to enrich the transition of the telephone patch to provide ability to transform the signaling from particular telephone to backward channel information and send to radio based on authentication of the telephone user. With this invention, the authenticated telephone user is able to indicate the transmitting radio user to stop transmitting and listen to the telephone user. It's vital in the cases that telephone user needs to broadcast urgent/emergent information to the radio users. The process for the telephone user interrupting an on-going radio voice transmission is: 1. Telephone user request to interrupt the on going radio voice transmission by pressing particular button from telephone. 2. Upon detect the particular button pressing, telephone patch requests telephone user to input pin code. 3. Telephone patch validate the input pin code and if it's valid code, it generates backward channel data and send to radio network to indicate radio to stop transmission.. 4. The radio receives the backward data from telephone user and stop transmission. 5. Once the transmitting radio stops transmission, telephone patch informs telephone user that the channel is cleared. The telephone user can transmit and the radios in the network are able to listen to the telephone user. An example to apply this invention is give below for the ETSI - DMR protocol based radio network. DMR defines Reverse Burst for backward channel, which could be utilized in telephone-radio interconnect system to transmit stop-transmission request from telephone user to transmitting radio user. (There is attachment to describe the invention in detail at below).

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At least one non-text object (such as an image or picture) has been suppressed.

This is the abbreviated version, containing approximately
49% of the total text.

Telephone
Interrupt/Preempt
Radio Transmission in Telephone-radio Interconnect System

By Xiuru Liang, Ruiqi Wu

Motorola, Inc.

Government
and Public Safety

ABSTRACT

In
existing telephone-radio interconnect system, telephone user is unable to interrupt/preempt
radio user’s transmission during interconnection call even if telephone user has
urgent or emergent information to broadcast. This documentation sets forth a
method for telephone user to interrupt/preempt radio user’s transmission during an interconnection
call in telephone-radio interconnect system.

PROBLEM

A
typical telephone-radio interconnection system is shown in Figure 1, a repeater is connected to telephone patch, which
acts as telephone gateway and connected to PSTN/PABX. Several radio subscribers
can be served by the repeater to communicate with each other or with a
telephone which resides in PSTN/PABX network. A telephone-radio
interconnection call can be initiated by the telephone user or by the radio
user, taking the call initiated
from telephone side for example, telephone user dials the target radio’s ID and
then telephone patch will ring out to the radio, the call will be established once the
target radio answers with access code replied. As telephone line works in
full-duplex mode while the radio works in half-duplex mode, to maintain the
call, usually impolite mode is used by the radio to talk back to telephone when
it’s receiving voice from telephone, the signal path from telephone to radio
will be turned off by telephone patch once there is carrier from radio been
detected by the repeater, and after that the signal path from radio to
telephone will be setup.

Usually
a priority scheme is used in radio system to provide availability for higher
priority users under urgent/emergent scenario, higher priority permission
provisioned radio user can interrupt/preempt other lower priority radios’
transmission.

The
telephone user partied in telephone-radio
interconnection call should also be able to act as higher priority user, however,
as the radio works in half-duplex mode and can not receive during transmit or
vice versa, only the radio
user can interrupt/preempt telephone user’s speaking, whereas the telephone
user can not interrupt/preempt radio user’s speaking. None of
existing telephone-radio
interconnect system provides the functionality for telephone to interrupt/preempt
radio transmission.

SOLUTION

The
come forth of backward channel mechanism in radio protocols, for example, the
ETSI- Digital Mobile Radio (DMR) Systems protocol’s RC (Reverse Channel) burst,
make it possible that a receiving radio subscriber to send backward information
to the transmitting radio subscriber during receive.

This
disclosure intends to provide the capability
to higher priority provisioned
telephone users to interrupt/preempt radio user’s tra...